#!/usr/bin/python

from itertools import imap
import unittest, sys, findbits

class TestFindBits(unittest.TestCase):
	def setUp(self):
		self.old_stdout = sys.stdout
		sys.stdout = OutputBuffer()

	def tearDown(self):
		sys.stdout = self.old_stdout

	INVERT_CASES = [
			('10', '01'),
			('', ''),
			]
	def test_invert(self):
		self.commutative_test(findbits.invert, self.INVERT_CASES)

	SEARCH_CASES = [
			('1111', '10111101', ['Match at bit 2', '0<1111>0']),
			('00', '10111101', ['Not found']),
			]
	def test_search(self):
		for target, data, expected_fragments in self.SEARCH_CASES:
			sys.stdout.clear_buffer()
			findbits.search(target, data)
			for fragment in expected_fragments:
				self.assertIn(fragment, sys.stdout.content)

	BINSTRING_CASES = [
			(42, '101010'),
			(1, '1'),
			(0, ''),
			]
	def test_binstring(self):
		self.unary_operation_test(findbits.binstring, self.BINSTRING_CASES)

	REVERSE_CASES = [
			('abc', 'cba'),
			('', ''),
			]
	def test_stringreverse(self):
		self.commutative_test(findbits.stringreverse, self.REVERSE_CASES)

	def commutative_test(self, operation, cases):
		self.unary_operation_test(operation, cases)
		self.unary_operation_test(operation, imap(reversed, cases))

	def unary_operation_test(self, operation, cases):
		for case_in, case_out in cases:
			self.assertEqual(operation(case_in), case_out)


class OutputBuffer(object):
	def __init__(self):
		self.clear_buffer()
	
	def clear_buffer(self):
		self.content = ''
	
	def write(self, data):
		self.content += data


if __name__ == '__main__':
	unittest.main()
